what does pri mean?
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Thread: what does pri mean?

  1. #1
    audiophile Array
    Join Date
    Mar 2003

    what does pri mean?

    on my gas switch thing there is "on / res / pri" what's pri mean? and what does it do?

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  3. #2
    Registered Offender Array Dawg's Avatar
    Join Date
    Jun 2003
    In a van, down by the river.
    07 M109R LE
    The standard petcock has ON-OFF-RES (RESERVE). OFF is, well, off. ON takes fuel from a tube that sticks up from the petcock body into the tank. When the fuel level goes below the top of the tube, the carb runs out of gas until you turn on the reserve. The RES draws fuel from the bottom of the tank. Both tubes usually have fine wire filter screens on them and another screen in the petcock it's self.

    The second type of petcock has a diaphragm that automatically shuts off the gas when the engine stops. You will see a hose going from the petcock to a fitting on the intake manifold of one of the carbs. This supplies vacuum to one side of the diaphragm, opening the fuel valve inside the petcock. These petcocks have three settings. ON-RESERVE-PRI. ON is on. Reserve is reserve and PRI is Prime. Prime bypasses the diaphragm so you can fill the carbs with gas after they have been drained. Set it on PRI, fill the carbs and put it back to ON. Sometimes, ON is called MAIN.
    It's all fun and games till someone loses an Eye, Then It's Just Fun!!

  4. #3
    Addicted to two wheels Array rscudiver's Avatar
    Join Date
    Jun 2003
    Kawasaki ZRX1200R
    If it's an older bike it stands for 'Prime' as in prime the carbs and fill up the float bowls if it ran out of gas or has sat for a while. Dawg is right.

  5. #4
    Melodious Array Brendan's Avatar
    Join Date
    Apr 2002
    Green Dolphin St.
    if it ran out of gas or has sat for a while
    Or after the bike's been tipped over on its side.
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  6. #5
    Moderator Array TeeTee's Avatar
    Join Date
    Feb 2002
    Out to pasture in the 'Wack
    04 Kawi Z1000,
    Quote Originally Posted by Brendan
    Or after the bike's been tipped over on its side.
    Um.... actually there's USUALLY no need to set to PRIME after a dump.

    But what can happen after a dump with a bike that has carbs is that the gas drains from the upper carbs to the lower carbs since the floats are not able to control this when on their sides. The proper procedure is to hold the throttle half open and start the bike. At first it'll start with a lot of coughing and rough running but that will clear over a couple of seconds and you can roll off the throttle at the same time to hold the revs to around 5K as it clears.
    A backyard mechanic without a service manual is just like a hooker without a lamp pole.... they are both in the dark.

  7. #6
    Registered Abuser Array rubberhead's Avatar
    Join Date
    Apr 2005
    blue VFR
    Do not leave it on Prime for any longer than necessary. If you froget about it, you might flood the carbs. Or if you store it for the winter, you might have to clean out the carbs as part of your spring maintenance.

    So I've heard, anyway.
    I have two Hondas. Can I breed them?

  8. #7
    retired panda racer...~_~ Array HydeNobuyuki's Avatar
    Join Date
    Dec 2003
    It's big and heavy.. must be a sport tourer
    i think my owner's manual says to switch to prime when you used up main fuel level of gas....

    when you're in the on position and it runs dry, goto prime for some time before switching to reserve... but consult your owner's manual for details specific to your bike...
    Are you a Dr Jeckyl? or Mr Hyde?

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  9. #8
    Moderator Array Mighty Kentor's Avatar
    Join Date
    Mar 2004
    Mission, BC
    2004 R1, 2005 DL1000 V-Strom
    Specifically, it's a fuel valve. Turn the valve to pri "prime" for 30 seconds or so. This bypasses the vacuum shutoff, allowing fuel to fill the carburetor float chambers and facilitate a quicker, easier first start.
    Reformatted to fit your screen.

  10. #9
    PRI stands for primadonna. don't use it unless you consider yourself one.

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